Veritas observations of day-scale flaring of m 87 in 2010 april

Hanna, D.; Bouvier, A.; Theiling, M.; Wakely, S. P.; Quinn, J.; Pichel, A.; Arlen, T.; Holder, J.; Collins-Hughes, E.; Gyuk, G.; Tešić, G.; Cesarini, A.; Krawczynski, H.; Karlsson, N.; Benbow, W.; Furniss, A.; Skole, C.; Kieda, D.; Humensky, T. B.; Finnegan, G.; Grube, J.; Hui, C. M.; Cannon, A.; Zitzer, B.; Schroedter, M.; Mukherjee, R.; Reyes, L. C.; Moriarty, P.; McCann, A.; Dickherber, R.; Nuñez, P. D.; Falcone, A.; Finley, J. P.; Kertzman, M.; Şentürk, G. D.; Guenette, R.; Rose, H. J.; Pohl, M.; Duke, C.; Williams, D. A.; Reynolds, P. T.; Bradbury, S. M.; Tyler, J.; Orr, M.; Vivier, M.; Aliu, E.; Griffin, S.; Roache, E.; Krennrich, F.; Weisgarber, T.; Imran, A.; Weinstein, A.; Ward, J. E.; Otte, A. N.; Maier, G.; Byrum, K.; LeBohec, S.; Beilicke, M.; Aune, T.; Sembroski, G. H.; Ruppel, J.; Bugaev, V.; Buckley, J. H.; Tsurusaki, K.; Varlotta, A.; Errando, M.; Connolly, M. P.; Perkins, J. S.; McArthur, S.; Gall, D.; Majumdar, P.; Staszak, D.; Hughes, G.; Huan, H.; Lang, M. J.; Cui, W.; Galante, N.; Thibadeau, S.; Ragan, K.; Saxon, D. B.; Vassiliev, V. V.; Godambe, S.; Vincent, S.; Park, N.; Fortson, L.; Ong, R. A.; Ciupik, L.; Weekes, T. C.; Madhavan, A. S; Prokoph, H.; Kaaret, P.

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Date

2012-02-01

Author

Aliu, E.

Arlen, T.

Aune, T.

Beilicke, M.

Benbow, W.

Bouvier, A.

Bradbury, S. M.

Buckley, J. H.

Bugaev, V.

Byrum, K.

Cannon, A.

Cesarini, A.

Ciupik, L.

Collins-Hughes, E.

Connolly, M. P.

Cui, W.

Dickherber, R.

Duke, C.

Errando, M.

Falcone, A.

Finley, J. P.

Finnegan, G.

Fortson, L.

Furniss, A.

Galante, N.

Gall, D.

Godambe, S.

Griffin, S.

Grube, J.

Guenette, R.

Gyuk, G.

Hanna, D.

Holder, J.

Huan, H.

Hughes, G.

Hui, C. M.

Humensky, T. B.

Imran, A.

Kaaret, P.

Karlsson, N.

Kertzman, M.

Kieda, D.

Krawczynski, H.

Krennrich, F.

Lang, M. J.

LeBohec, S.

Madhavan, A. S

Maier, G.

Majumdar, P.

McArthur, S.

McCann, A.

Moriarty, P.

Mukherjee, R.

Nuñez, P. D.

Ong, R. A.

Orr, M.

Otte, A. N.

Park, N.

Perkins, J. S.

Pichel, A.

Pohl, M.

Prokoph, H.

Quinn, J.

Ragan, K.

Reyes, L. C.

Reynolds, P. T.

Roache, E.

Rose, H. J.

Ruppel, J.

Saxon, D. B.

Schroedter, M.

Sembroski, G. H.

Şentürk, G. D.

Skole, C.

Staszak, D.

Tešić, G.

Theiling, M.

Thibadeau, S.

Tsurusaki, K.

Tyler, J.

Varlotta, A.

Vassiliev, V. V.

Vincent, S.

Vivier, M.

Wakely, S. P.

Ward, J. E.

Weekes, T. C.

Weinstein, A.

Weisgarber, T.

Williams, D. A.

Zitzer, B.

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Aliu, E. Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Byrum, K.; Cannon, A.; Cesarini, A.; Ciupik, L.; Collins-Hughes, E.; Connolly, M. P.; Cui, W.; Dickherber, R.; Duke, C.; Errando, M.; Falcone, A.; Finley, J. P.; Finnegan, G.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Godambe, S.; Griffin, S.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Huan, H.; Hughes, G.; Hui, C. M.; Humensky, T. B.; Imran, A.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Madhavan, A. S; Maier, G.; Majumdar, P.; McArthur, S.; McCann, A.; Moriarty, P.; Mukherjee, R.; Nuñez, P. D.; Ong, R. A.; Orr, M.; Otte, A. N.; Park, N.; Perkins, J. S.; Pichel, A.; Pohl, M.; Prokoph, H.; Quinn, J.; Ragan, K.; Reyes, L. C.; Reynolds, P. T.; Roache, E.; Rose, H. J.; Ruppel, J.; Saxon, D. B.; Schroedter, M.; Sembroski, G. H.; Şentürk, G. D.; Skole, C.; Staszak, D.; Tešić, G.; Theiling, M.; Thibadeau, S.; Tsurusaki, K.; Tyler, J.; Varlotta, A.; Vassiliev, V. V.; Vincent, S.; Vivier, M.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; Weisgarber, T.; Williams, D. A.; Zitzer, B. (2012). Veritas observations of day-scale flaring of m 87 in 2010 april. The Astrophysical Journal 746 (2),

Published Version

http://iopscience.iop.org/article/10.1088/0004-637X/746/2/141/pdf

Abstract

VERITAS has been monitoring the very-high-energy (VHE; &gt; 100 GeV) gamma-ray activity of the radio galaxy M87 since 2007. During 2008, flaring activity on a timescale of a few days was observed with a peak flux of (0.70 +/- 0.16) x 10(-11) cm(-2) s(-1) at energies above 350 GeV. In 2010 April, VERITAS detected a flare from M 87 with peak flux of (2.71 +/- 0.68) x 10(-11) cm(-2) s(-1) for E &gt; 350 GeV. The source was observed for six consecutive nights during the flare, resulting in a total of 21 hr of good-quality data. The most rapid flux variation occurred on the trailing edge of the flare with an exponential flux decay time of 0.90(-0.15)(+0.22) days. The shortest detected exponential rise time is three times as long, at 2.87(+1.65)(-0.99) days. The quality of the data sample is such that spectral analysis can be performed for three periods: rising flux, peak flux, and falling flux. The spectra obtained are consistent with power-law forms. The spectral index at the peak of the flare is equal to 2.19 +/- 0.07. There is some indication that the spectrum is softer in the falling phase of the flare than the peak phase, with a confidence level corresponding to 3.6 standard deviations. We discuss the implications of these results for the acceleration and cooling rates of VHE electrons in M 87 and the constraints they provide on the physical size of the emitting region.

URI

http://hdl.handle.net/10379/10214

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